Forced aging apparatus and technique for motor vehicle vent gas purification catalysis material

A catalytic material and exhaust gas purification technology, which can be used in chemical analysis using catalysis, preparation of test samples, etc., and can solve problems such as expensive, difficult scientific analysis, and affecting the scientific nature of research progress.

Inactive Publication Date: 2009-07-08
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with the second type of bench test, due to the highly simplified exhaust conditions, even if it is considered that the complete conversion of carbon monoxide, residual hydrocarbons and nitrogen oxides can be considered to be acceptable, the comprehensive effect is still not considered. The fuel ratio conditions and the significant presence of gases such as water vapor and carbon dioxide are of concern (see the literature "Applied Catalysis B: Environmental 76(2007) 357")
[0008] To sum up

Method used

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  • Forced aging apparatus and technique for motor vehicle vent gas purification catalysis material
  • Forced aging apparatus and technique for motor vehicle vent gas purification catalysis material
  • Forced aging apparatus and technique for motor vehicle vent gas purification catalysis material

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The sample of Comparative Example 1 was subjected to hydrothermal forced aging treatment changing the air-fuel ratio, and the treatment space velocity was 10000h -1 , from room temperature to 1050°C at a temperature of 10°C / min. After treatment for 10 hours, the exhaust gas composition in the first 5 hours is hot nitrogen containing 10% water vapor, 5% hydrogen and 0% carbon dioxide by volume, and the exhaust gas composition in the next 5 hours It is hot air containing 10% water vapor by volume. The catalytic material is still in the aging furnace during the cooling process, and the dry air is used as a protective atmosphere. The chemical and physical properties and catalytic evaluation results of the materials are shown in Table 1.

[0041] Table 1 is the basic physical property investigation and catalytic activity comparison of cerium-zirconium rare earth catalytic materials based on the series of aging treatments of the present invention.

[0042]

[0043]

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Embodiment 6

[0052] The comparative example 4 sample was subjected to Duramax engine bench aging treatment, and the processing space speed was 15000h -1 , to simulate the 100000km operating load, and select 1 / 3, 2 / 3 and full-time operating nodes corresponding to 4, 8, and 12-hour aging for investigation. The chemical and physical properties and catalytic evaluation results of the materials are shown in Table 2.

Embodiment 2

[0054] The comparative example 4 sample is subjected to hydrothermal forced aging treatment, and the treatment space velocity is 15000h -1 , the exhaust gas component is hot air containing 10% water vapor, 5% carbon dioxide and 0% hydrogen by volume, and the temperature is raised from room temperature to 800°C at 10°C / min for 4, 8, and 12 hours. Immediately after aging The aging reaction tube was taken out and lowered to room temperature, during which dry air was used as a protective atmosphere. The chemical and physical properties and catalytic evaluation results of the materials are shown in Table 2.

[0055] Table 2 is a comparison of the phase composition analysis and catalytic activity of the barium-cerium-aluminum composite oxidation catalytic material based on the series of aging treatments of the present invention. In Table 2, comparative example 4 corresponds to the physical and chemical properties of fresh barium-cerium-aluminum-based catalytic materials, and compar...

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Abstract

The invention relates to a device and a process method for forcedly aging a motor vehicle tail gas purifying and catalyzing material. The process comprises: loading the motor vehicle tail gas purifying and catalyzing material into an aging reaction tube and heating the material; introducing an aged gas into a bed layer of a reactor catalyzing material for aging treatment for 5 to 20 hours at a temperature of between 400 to 1,300 DEG C; and taking out the aged catalyzing material, and testing the material. The aging device mainly comprises a gas path, an aging tube reactor and a temperature control component. The device and the method are used for carrying out service life investigation and activity screening on the motor vehicle tail gas purifying and catalyzing material containing at least one class of oxide corresponding to elements like cerium, zirconium, aluminum, barium and the like. The device and the method have the advantages of real and reliable test result, simple operation process, small operation risk, good repeatability and easy realization of engineering scale-up. Highly toxic waste gas, waste liquid and waste residue are not discharged in the process of processing so the invention meets the circular economy requirements.

Description

technical field [0001] The invention relates to a motor vehicle tail gas purification catalytic technology, in particular to a device and a process method for forced aging of a motor vehicle tail gas purification catalytic material. Background technique [0002] The main pollutants in the exhaust gas of internal combustion engines represented by gasoline vehicles, diesel vehicles, motorcycles and other lean-burn engines include carbon monoxide, residual hydrocarbons from incomplete combustion and nitrogen oxides produced when oxygen is excessive. At present, the mainstream catalytic materials for purification of motor vehicle exhaust generally use ceramics as the carrier of catalytic materials, and use precious metals, transition metals, alkali (earth) metals, and rare earth element oxides as key active components. Oxide activators represented by elements such as Ce, Zr, Al, and Ba play a key role in the mainstream motor vehicle exhaust purification catalytic technology that...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N31/10
Inventor 沈美庆翁端杨铭王军
Owner TIANJIN UNIV
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